HarmonyOS 鸿蒙Next PhotoPickerComponent怎么退出预览模式

目前没有直接退出预览的接口，onExitPhotoBrowser是退出大图的回调，相当于退出预览，不知道是否满足要求

import {
  PhotoPickerComponent, PickerController, PickerOptions,
  DataType, BaseItemInfo, ItemInfo, PhotoBrowserInfo, ItemType, ClickType,  PhotoBrowserRange
} from '@ohos.file.PhotoPickerComponent';
import photoAccessHelper from '@ohos.file.photoAccessHelper';

@Entry
@Component
struct PickerDemo {
  pickerOptions: PickerOptions = new PickerOptions();
  @State pickerController: PickerController = new PickerController();
  @State selectUris: Array<string> = new Array<string>();
  @State currentUri: string = '';
  @State isBrowserShow: boolean = false;

  aboutToAppear() {
    this.pickerOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_VIDEO_TYPE;
    this.pickerOptions.maxSelectNumber = 5;
    this.pickerOptions.isSearchSupported = false;
    this.pickerOptions.isPhotoTakingSupported = false;
  }

  private onItemClicked(itemInfo: ItemInfo, clickType: ClickType): boolean {
    if (!itemInfo) {
      return false;
    }
    let type: ItemType | undefined = itemInfo.itemType;
    let uri: string | undefined = itemInfo.uri;
    if (type === ItemType.CAMERA) {
      // 点击相机item
      return true; // 返回true则拉起系统相机，若应用需要自行处理则返回false。
    } else {
      if (clickType === ClickType.SELECTED) {
        // 应用做自己的业务处理
        if (uri) {
          this.selectUris.push(uri);
          this.pickerOptions.preselectedUris = [...this.selectUris];
        }
        return true; // 返回true则勾选，否则则不响应勾选。
      } else {
        if (uri) {
          this.selectUris = this.selectUris.filter((item: string) => {
            return item != uri;
          });
          this.pickerOptions.preselectedUris = [...this.selectUris];
        }
      }
      return true;
    }
  }

  private onEnterPhotoBrowser(photoBrowserInfo: PhotoBrowserInfo): boolean {
    // 进入大图的回调
    this.isBrowserShow = true;
    return true;
  }

  private onExitPhotoBrowser(photoBrowserInfo: PhotoBrowserInfo): boolean {
    // 退出大图的回调
    this.isBrowserShow = false;
    return true;
  }

  private onPickerControllerReady(): void {
    // 接收到该回调后，便可通过pickerController相关接口向picker发送数据，在此之前不生效。
  }

  private onPhotoBrowserChanged(browserItemInfo: BaseItemInfo): boolean {
    // 大图左右滑动的回调
    this.currentUri = browserItemInfo.uri ?? '';
    return true;
  }

  build() {
    Flex({
      direction: FlexDirection.Column,
      justifyContent: FlexAlign.Center,
      alignItems: ItemAlign.Center
    }) {
      PhotoPickerComponent({
        pickerOptions: this.pickerOptions,
        onItemClicked: (itemInfo: ItemInfo, clickType: ClickType): boolean => this.onItemClicked(itemInfo, clickType), // 该接口可替代上面两个接口
        onEnterPhotoBrowser: (photoBrowserInfo: PhotoBrowserInfo): boolean => this.onEnterPhotoBrowser(photoBrowserInfo),
        onExitPhotoBrowser: (photoBrowserInfo: PhotoBrowserInfo): boolean => this.onExitPhotoBrowser(photoBrowserInfo),
        onPickerControllerReady: (): void => this.onPickerControllerReady(),
        onPhotoBrowserChanged: (browserItemInfo: BaseItemInfo): boolean => this.onPhotoBrowserChanged(browserItemInfo),
        pickerController: this.pickerController,
      }).height('60%').width('100%')
      
      // 这里模拟应用侧底部的选择栏
      if (this.isBrowserShow) {
        Row() {
          ForEach(this.selectUris, (uri: string) => {
            if (uri === this.currentUri) {
              Image(uri).height('10%').width('10%').onClick(() => {
              }).borderWidth(1).borderColor('red')
            } else {
              Image(uri).height('10%').width('10%').onClick(() => {
                this.pickerController.setData(DataType.SET_SELECTED_URIS, this.selectUris);
                this.pickerController.setPhotoBrowserItem(uri, PhotoBrowserRange.ALL);
              })
            }
          }, (uri: string) => JSON.stringify(uri))
        }
      } else {
        Button('预览').width('33%').height('5%').onClick(() => {
          if (this.selectUris.length > 0) {
            this.pickerController.setPhotoBrowserItem(this.selectUris[0], PhotoBrowserRange.SELECTED_ONLY);
          }
        })
      }
    }
  }
}

同时点击图片，实现图片预览，点击图片周边蒙层后，退出预览，预览图中可对图片进行放大缩小等基础操作，可以参考这个demo：https://developer.huawei.com/consumer/cn/doc/harmonyos-faqs-V5/faqs-arkui-332-V5